178 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



DDD. Leaves not rugose. 



Leaves furfuraceous beneath. Teeth small 107. Q. furfuracea. 



Leaves glabrate, but sometimes with axillary tufts beneath. 



Leaves thick and small, scarcely venulose 91. Q. depressa. 



Leaves thin, or else veiny. 

 Leaves moderate in size (scarcely 4 cm. wide and 12 cm. long). 

 F. Leaves lanceolate or lance-oblong; teeth small. 

 Leaves rather broad, or rounded at base. 



Leaves evergreen, subcoriaceous 61. Q. devia. 



Leaves deciduous. 



Leaves not very veiny 106. Q. sartorii. 



Leaves very venulose 108. Q. grahami. 



Leaves narrower (four times as long as broad), and subacute 

 at base. 

 Leaves neither revolute nor very prominently veiny. 



80. Q. affinis. 

 Leaves somewhat revolute and more venulose. 



102. Q. cortesii. 



FF. Leaves ovate-lanceolate, venulose 108. Q. grahami. 



FFF. Leaves oblanceolate, with coarse teeth. 



Twigs and petioles glabrous 87. Q. major. 



Twigs and petioles pubescent 88. Q. barbinervis. 



FFFF. Leaves oblong, rather pungently tooted. 93. Q. sideroxyla. 

 Leaves large, with rather coarse teeth. 

 Leaves lanceolate or oblanceolate. 



Leaves elongate (four times as long as broad), much crisped. 



103. Q. huitamalcana. 

 Leaves broader (three times as long as broad), scarcely crisped. 

 Acorn moderately small. 



Acorn depressed, nearly included 101. Q. grandis. 



Acorn ovoid, scarcely half included. 



Leaves evergreen 109. Q. acutifolia. 



Leaves deciduous 110. Q. xalapensis. 



Acorn very large (40 mm. long) 104. Q. chiapasensis. 



Leaves ovate. Acorn very large 105. Q. skinneri. 



1. Quercus insignis Mart. & Gal. Bull. Acad. Brux. 10': 210. 1843. 

 Veracruz; type locality, on the flanks of INIount Orizaba. 



Large deciduous tree with stout villous twigs ; buds glabrous, 5 to 7 mm. 

 in diameter, 10 to 15 mm. long; leaves large (4 to 7 cm. wide, 9 to 16 cm. long), 

 rugose, somewhat hairy beneath, oblanceolate-obovate, obtuse or submucronate, 

 short-petioled, usually short-serrate above; acorn depressed, blunt, 50 to 70 

 mm. in diameter, half-included, the saucer-shaped cup with thick squarrose 

 scales. " Encina," " aoatl," " ahoaquahuitl " (Ramirez). 



2. Quercus strombocarpa Liebm. Overs. Dansk. Vid. Selsk. Forh. 1854: 176. 



1854. 



Veracruz ; type locality, San Bartolom6. 



Resembling the preceding; leaves large (6 to 9 cm. wide. 14 to 17 cm. long), 

 elliptic-obovate ; acorn conical, pointed, 50 mm. in diameter, the lower third 

 included in the very turbinate cup. " Encina," " aoatl," " ahoaquahuitl " 

 (Ramirez.) 



